Biogenic gas generation effects on anthracite molecular structure and pore structure  

作　　者：Aikuan WANG Pei SHAO Qinghui WANG 

机构地区：[1]Key Laboratory of Coalbed Methane Resources&Reservoir Formation Process(Ministry of Education),China University of Mining&Technology,Xuzhou 221008,China [2]School of Resources and Geosciences,China University of Mining&Technology,Xuzhou 221116,China [3]Department of Surveying and Planning,Shangqiu Normal University,Shangqiu 476000,China

出　　处：《Frontiers of Earth Science》2021年第2期272-282,共11页地球科学前沿（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(No.2019QNA33)。

摘　　要：This study carries out a simulated experiment of biogenic gas generation and studies the effects of gas generation on the pore structure and molecular structure of anthracite by mercury intrusion porosimetry,X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).The results show that methanogenic bacteria can produce biogenic gas from anthracite.CO_(2) and CH4 are the main components of the generated biogas.After generation,some micropores(<10 nm)and transitional pores(10–100 nm)in the coal samples transform into large pores.In the high-pressure stage(pressure>100 MPa)of the mercury intrusion test,the specific surface area decreases by 19.79%compared with that of raw coal,and the pore volume increases by 7.25%in total.Microbial action on the molecular structure causes changes in the pore reconstruction.The FT-IR data show that the side chains and hydroxyl groups of the coal molecular structure in coal are easily metabolized by methanogenic bacteria and partially oxidized to form carboxylic acids.In addition,based on the XRD data,the aromatic lamellar structure in the coal is changed by microorganisms;it decreases in lateral size(La)and stacking thickness(Lc).This study enriches the theory of biogenic coalbed gas generation and provides a pathway for enhancing the permeability of high-rank coal reservoirs.

关 键 词：biogenic gas ANTHRACITE pore structure molecular structure 

分 类 号：P61[天文地球—矿床学]